2025/08/15 by Aina Sumiyoshi, Sumiyoshi, Aina, Keisuke Ishizeki +3
Materials Science · Physics and Astronomy · #Carbon Nanotubes in Composites #stochastic dynamics and bifurcation #Quantum and electron transport phenomena
paper · doi:10.48550/arxiv.2508.11201
We theoretically investigate current noise in metallic carbon nanotubes induced by electron-phonon scattering, focusing on the probability density function (PDF) of the current that characterizes the nonequilibrium steady state. Quantum transport simulations combined with analyses of higher-order statistical moments reveal that the PDF evolves continuously from a Gaussian distribution in the ballistic regime to a non-Gaussian gamma distribution in the diffusive regime. In the crossover regime, the PDF exhibits pronounced asymmetry, attributed to a statistical imbalance in the number of conduction pathways contributing to high- and low-current events. Furthermore, in the diffusive regime, we identify non-Markovian features arising from high-frequency resonances in the current noise, which dominate the asymptotic scaling behavior of the current variance.